JP2006050080A - Transmission antenna system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly practical transmission antenna system with a configuration wherein a superturnstile antenna (VHF broadcast antenna) and a UHF broadcast antenna formed by panel antennas are installed side by side at the same ground level. <P>SOLUTION: The superturnstile antenna (10) formed by a plurality of Batwing antennas is fitted to a support pole (1) perpendicularly installed at a prescribed ground level at an upper part or the like of a broadcast tower, an auxiliary support pole (2) is installed in parallel with the support pole at a prescribed distance from the support pole, the panel antenna array (21) or an omni-directional multi-panel antenna array (20) configured with the plurality of panel antennas is fitted to the auxiliary support pole so as to install the superturnstile antenna and the panel antenna array/omni-directional multi-panel antenna array at the same ground level side by side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission antenna device that can be installed by effectively using a limited space in a broadcast tower.

  The super turn style antenna is widely used as an antenna for VHF band television broadcasting. This super turn style antenna has a structure in which four badwing antennas (radiating elements) are provided orthogonal to each other around a steel tower (support column). In order to increase the power gain, a plurality of bad wing antennas may be provided in multiple stages at intervals of one wavelength, or when a multi-channel super turn style antenna is provided in multiple stages, reinforcing support pillars may be provided around the bad wing antennas. Has been proposed (see, for example, Patent Document 1).

On the other hand, constructing a multi-surface synthetic antenna by arranging a plurality of panel antennas in which a plurality of radiating elements (for example, dipole antennas) are arranged in a diversity manner on a panel-shaped reflector in an annular shape around a steel tower (support pillar) Is known (see, for example, Patent Document 2). This type of multi-sided composite antenna is widely used as an antenna for UHF band television broadcasting, for example.
Japanese Utility Model Publication No. 46-19150 Japanese Utility Model Publication No. 63-106208

  By the way, when the super turn style antenna and the multi-plane synthetic antenna described above are installed in the same broadcasting tower (steel tower), the super turn style antenna is generally attached to the support pillar provided vertically on the upper part of the steel tower that constructs the broadcasting tower. It is conceivable that the multi-surface synthetic antenna is installed around the upper end (upper steel structure) of the steel tower. However, a multi-sided synthetic antenna will be provided below the super turn style antenna, and it cannot be denied that there is a difference in antenna ground height that has a great influence on the radio wave service area.

  Therefore, it is conceivable to provide a polyhedral synthetic antenna around the super turn style antenna. However, in this case, since a plurality of panel antennas constituting the multi-plane synthetic antenna are arranged surrounding the super turn style antenna, there is a concern about interference between these antennas. In addition, there is a possibility that the antenna characteristics of the super turn style antenna are greatly hindered by the multi-plane synthetic antenna (a plurality of panel antennas) surrounding the super turn style antenna. In terms of structure, for example, it is necessary to provide a large structure (antenna support) for supporting the multi-sided synthetic antenna around the support pillar supporting the super turn style antenna, which increases the equipment cost. There are problems such as.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a transmitting antenna device capable of providing a super turn style antenna and a panel antenna by effectively using a limited space in a broadcasting tower. Is to provide.
In particular, the present invention is constructed by a so-called panel antenna having a configuration in which a dipole antenna or a double loop antenna is arranged on a panel plate forming a reflector, and a VHF band television broadcasting antenna represented by a super turn style antenna. An object of the present invention is to provide a highly practical transmitting antenna device having a configuration in which UHF band television broadcasting antennas are installed side by side at the same ground height.

  In order to achieve the above-described object, a transmitting antenna device according to the present invention includes a support column provided vertically at a predetermined ground height such as an upper part of a broadcasting tower, and a support column supported by the support column and perpendicular to each other around the support column. A super turn style antenna constructed by a plurality of bad wing antennas arranged in an auxiliary support, an auxiliary support attached to the support pillar, and an antenna surface supported by the auxiliary support at a certain distance from the support pillar And a panel antenna provided in parallel with the support column.

  That is, in the transmitting antenna device according to the present invention, an auxiliary support for supporting the panel antenna is attached to a support column to which a super turn style antenna constructed by a plurality of badwing antennas is attached, and the auxiliary support is attached to the auxiliary support. The super turn style antenna and the panel antenna are arranged side by side at the same ground height by attaching a panel antenna in parallel to the support column at a certain distance from the support column.

  Preferably, as described in claim 2, the auxiliary support is placed at a position where the surface (antenna surface) of the bad wing antenna for constructing the super turn style antenna is extended, or the surfaces of the bad wing antenna arranged at right angles to each other. It is characterized in that the panel antenna can be installed without interfering with the super turn style antenna so as to be able to support the panel antenna in a region sandwiched between the two.

  Incidentally, the panel antenna comprises a plurality of panel antennas that are supported by the auxiliary support and arranged around the auxiliary support pillars to construct a multi-sided composite antenna. In particular, the plurality of panel antennas are arranged on a surface excluding the surface facing the support column as described in claim 4 to construct a multi-plane synthetic antenna having a null direction as the direction facing the support column It is preferable to provide it.

  The panel antenna is realized, for example, by arranging a dipole antenna or a dual loop antenna as a radiating element on a panel plate having a predetermined size as a reflector. Preferably, the super turn style antenna is realized in the VHF band, and the panel antenna is realized in the UHF band.

  According to the transmission antenna device having the above-described configuration, the support pillar to which the super turn style antenna is attached is provided with the auxiliary support body, and the auxiliary support body is parallel to the support pillar at a certain distance from the support pillar. Since only the panel antenna is attached, the ground clearance of the super turn style antenna and the panel antenna can be easily adjusted. In addition, the auxiliary support provided as described above and the panel antenna attached to the auxiliary support interfere with the super turn style antenna only by separating an appropriate distance from the super turn style antenna. Therefore, its presence hardly affects the characteristics of the super turn style antenna. As a result, it is possible to realize a transmission antenna device that can sufficiently draw out the antenna characteristics of the super turn style antenna and the panel antenna.

  In particular, if the installation position of the auxiliary support, and thus the installation position of the panel antenna, is set as described in claim 2, the installation position of the panel antenna can be controlled while preventing interference between the super turn style antenna and the panel antenna. It becomes possible to approach the turn style antenna. As a result, the entire transmission antenna device, particularly the antenna unit installed on the upper part of the broadcast tower or the like, can be configured in a compact manner.

  In addition, if a plurality of panel antennas are attached to the auxiliary support body and a multi-plane synthetic antenna is constructed with these panel antennas as described in claim 3, radio waves (for example, television broadcasts) are spread over a wide range from the multi-plane synthetic antenna. Wave) can be efficiently radiated (transmitted). In particular, as described in claim 4, a plurality of panel antennas are arranged on a surface excluding a surface facing the support column, and a multi-plane synthetic antenna is provided so as to obtain a radiation pattern having a null direction as a direction facing the support column. If constructed, effects such as a transmission antenna that is not affected by the influence (interference) of the super turn style antenna can be obtained.

  Therefore, for example, a super turn style antenna is used as a transmission antenna for VHF band television broadcasting, and a multi-sided composite antenna constructed by the panel antenna is used as a transmission antenna for UHF band television broadcasting, particularly a digital terrestrial television antenna. Both of these antennas can be effectively used at the same time, so that practically great effects can be obtained.

Hereinafter, a transmission antenna apparatus according to an embodiment of the present invention will be described with reference to the drawings, taking as an example an antenna apparatus installed in a broadcast tower that transmits television broadcast waves in the VHF band and the UHF band.
FIG. 1 shows a schematic configuration of a transmitting antenna device according to this embodiment, where (a) is a front view thereof and (b) is a plan configuration diagram thereof. This transmission antenna device is mounted on a support pillar (antenna support) 1 provided vertically on an upper portion of a broadcast tower (steel tower) (not shown) and used for mounting an antenna, and is constructed by a plurality of bad wing antennas 11. And a multi-sided synthetic antenna 20 constructed by a plurality of panel antennas 21, for example. Incidentally, the support column 1 is composed of a pipe body having a diameter of, for example, about 19 cm, which protrudes vertically (in the vertical direction) from the upper end of the broadcast tower (steel tower).

  The super turn style antenna 10 has four bad wing antennas 11a, 11b, 11c, and 11d at an angular interval of 90 ° around the support pillar 1, as shown in FIG. The antenna surfaces are arranged so as to be orthogonal to each other. These bad wing antennas 11 (11a, 11b, 11c, 11d) function as turn-style antennas that are omnidirectional (omnidirectional) antennas by being excited by giving a phase difference of 90 ° to each other. In particular, the super turn style antenna 10 according to this embodiment has an antenna unit composed of four badwing antennas 11 (11a, 11b, 11c, 11d) as a basic unit, as shown in FIG. For example, the antenna unit is provided in multiple stages at intervals of one wavelength. The size (vertical dimension) of the bad wing antenna 11 is about 2.5 to 3 m per stage in the case of a VHF band television broadcast wave (low channel) transmission antenna.

  On the other hand, the panel antenna 21 constituting the multi-sided composite antenna 20 has a loop-shaped radiating element as shown in FIG. 2 (a) and FIG. A four-element double-loop antenna 22 provided, and a flat main reflector 23 provided on the back side of the four-element double-loop antenna 22 in parallel with the antenna surface formed by the four-element double-loop antenna 22 Is done. The four-element twin-loop antenna 22 has an arc-shaped loop antenna element portion (radiating element) 25 whose circumference L is approximately one wavelength (λ) of the radio frequency, and has an approximately 1/2 wavelength (λ / 2). In this structure, four elements are formed via the parallel parallel feeding portion 26 having a length.

  The main reflector 23 provided on the back side of the four-element twin-loop antenna 22 reflects radio waves radiated from the loop antenna element section 25, so that the radio wave radiation characteristics as the panel antenna 21 can be obtained. It plays the role of giving unidirectionality in the direction perpendicular to the reflective surface. The sub-reflecting plates 24 provided on both side portions of the main reflecting plate 23 suppress the side lobes and back lobes in the panel antenna 21 by suppressing the radio waves that circulate through both side portions of the main reflecting plate 23, respectively. It plays a role to improve the directivity. The height h of these sub-reflecting plates 24 is set to, for example, about 0.01λ to 0.14λ with respect to the wavelength λ of the broadcast radio frequency.

  Further, the panel antenna 21 includes a protective cover (ray dome) 27 provided on the radio wave radiation surface so as to cover the four-element double loop antenna 22 described above. The protective cover 27 is made of a synthetic resin material or the like having good radio wave transmission, and is attached so as to cover the entire antenna surface via the sub-reflecting plate 24. Such a protective cover 27 protects the four-element dual loop antenna 22 from rain and wind, snow, dust, and the like, and also ensures the structural strength of the panel antenna 21 against wind pressure loads that are easily received when mounted on a broadcast tower. ing.

  The panel antenna 21 having such a structure or the multi-sided composite antenna 20 constructed by a plurality of panel antennas 21 is attached to the broadcast tower, particularly with a certain distance D from the support pillar 1 described above. This is performed by providing a bar-shaped auxiliary support 2 in parallel and attaching a panel antenna 21 to the auxiliary support 2. That is, as shown in FIG. 1 (a), a pair of upper and lower connecting members 3, 3 extending laterally from the support column 1 is provided on the support column 1 to which the super turn style antenna 10 is attached. 3, an auxiliary support 2 is provided at the tip of the support 3 in parallel with the support pillar 1.

  With respect to the position where the auxiliary support 2 is provided, for example, as shown in FIG. 1B, a position where the surface (antenna surface) of the bad wing antenna 11 for constructing the super turn style antenna 10 is extended, or FIG. , The region (orientation) sandwiched between the antenna surfaces of the two bad wing antennas 11 arranged at right angles to each other as shown by phantom lines, specifically, the position where the panel antenna 21 can be installed, specifically May be set to a position that makes an angle of 45 ° with the antenna surface of the bad wing antenna 11.

  And what is necessary is just to attach this panel antenna 21 to such an auxiliary | assistant support body 2 according to the direction which the electromagnetic wave radiated | emitted from the panel antenna 21 directs. At this time, it is possible to install the panel antenna 21 without being affected by the super turn style antenna 10 by setting the direction in which the radio wave is radiated from the panel antenna 21 so as not to face the support pillar 1. It becomes possible. In order to increase the power gain of the panel antenna 21, a plurality of panel antennas 21 may be provided in multiple stages as shown in FIG.

  In addition, when a plurality of (for example, three) panel antennas 21 are attached around the auxiliary support 2 and the multi-plane synthetic antenna 20 is constructed by these panel antennas 21, as shown in FIG. A plurality of panel antennas 21 may be attached while avoiding a surface facing the support pillar 1. Specifically, the three panel antennas 21 may be attached to the periphery of the auxiliary support 2 by changing their orientations by 90 ° by avoiding the surface facing the support pillar 1. Also in this case, the multi-plane composite antenna 20 constituted by a plurality of panel antennas 21 may be provided in multiple stages as shown in FIG. 1A, thereby increasing the power gain.

  When the UHF band television broadcast antenna is realized by the panel antenna 21, when the above-described four-element double loop antenna 22 is used as the radiating element, the vertical dimension of the panel antenna 21 is approximately 2 m. By the way, when a broadcast antenna for a certain channel in the VHF band is constructed by stacking three super turn style antennas 10 of about 2.5 to 3 m per stage, the vertical dimension of the VHF antenna is about 7.5 to 9 m. Become. On the other hand, if a broadcast antenna of a certain channel in the UHF band is constructed by stacking four panel antennas 21 of about 2 m per stage, the vertical dimension of the UHF antenna is about 8 m. Accordingly, the vertical dimensions of the three-stage super-turn style antenna 10 and the four-stage multi-sided composite antenna 20 are substantially equal. For example, as shown in FIG. If the mounting positions of the four-sided multi-plane synthetic antenna (panel antenna) 20 are matched, the mounting height positions of the antennas 10 and 20 (the ground height in the broadcasting tower) can be set substantially equal. It becomes.

  Therefore, at the same height position in one broadcasting tower, a television broadcasting antenna for VHF composed of a super-turn style antenna 10 and a television broadcasting antenna for UHF composed of a multi-surface synthetic antenna 20 constituted by using a panel antenna 21. Can be installed at the same time. In particular, the super turn style antenna 10 is attached to the support pillar 1 provided at the upper part of the broadcasting tower, and the panel antenna 20 is attached to the auxiliary support body 2 provided in parallel to the support pillar 1 on the side of the support pillar 1. The antennas 10 and 20 can be made to function without impairing the characteristics of the antennas 10 and 20, respectively.

  Here, each antenna characteristic of the super turn style antenna 10 and the multi-surface synthetic antenna 20 provided as described above will be described. The basic horizontal directivity of the super turn style antenna 10 is as shown by the characteristic HA1 in FIG. 3A, and the vertical directivity is as shown by the characteristic VA1 in FIG. 3B. Further, as disclosed in Patent Document 1 described above, even if a reinforcing support member is provided around the super turn style antenna 10 on the extension of the antenna surface of the badwing antenna, for example, the antenna characteristics are almost affected. There is nothing. Therefore, even if the auxiliary support 2 is provided at the position where the reinforcing support is provided and the panel antenna 21 is attached to the auxiliary support 2, the presence of these does not substantially affect the antenna characteristics of the super turn style antenna 10. Conceivable.

  Therefore, when the panel antenna 21 is attached to the auxiliary support 2 provided on the extension of the antenna surface of the bad wing antenna and the horizontal directivity of the super turn style antenna 10 is examined in this state, the characteristic HA2 is shown in FIG. As shown, it was confirmed that there was almost no change from the original antenna characteristics. Further, it was confirmed that the vertical directivity hardly changes from the original antenna characteristic although the half-value width is slightly widened as shown as characteristic VA2 in FIG. That is, as shown in FIG. 3, it was confirmed that the antenna characteristics (directivity) of the super turn style antenna 10 hardly changed regardless of the presence or absence of the panel antenna 21 and could be sufficiently put into practical use.

  On the other hand, the basic horizontal directivity of the multi-plane synthetic antenna 20 composed of the three-panel antennas 21 attached around the auxiliary support 2 at 90 ° intervals is as shown as characteristic HB1 in FIG. A substantially uniform radio wave radiation intensity can be obtained only in the direction in which the three panel antennas 21 are directed. In other words, a uniform radio field intensity can be obtained in a region excluding the direction where the panel antenna is not provided. The vertical directivity is as shown as characteristic VB1 in FIG.

  Therefore, when such a multi-surface synthetic antenna 20 is attached to the auxiliary support 2 described above, and particularly when the three panel antennas 21 are provided so as to avoid the direction facing the support pillar 1, the horizontal directivity characteristics are examined. It was confirmed that there is almost no change from the original antenna characteristic as shown as characteristic HB2 in (b). Further, when the vertical directivity characteristic was examined, it was confirmed that there was almost no change from the original antenna characteristic as shown as characteristic VB2 in FIG. This fact indicates that the support column 1 and the super-style antenna 10 attached to the support column 1 face each other on the surface where no radio wave is radiated from the three-plane composite antenna 20 including the three panel antennas 21 described above. Therefore, it can be considered that the antenna surfaces do not confront each other where these antennas 10 and 20 confront each other, and therefore radio wave interference does not occur.

  Therefore, as described above, the super turn style antenna 10 is attached to the support pillar 1 which is the upper construction part of one broadcasting tower, and the auxiliary support 2 provided on the support pillar 1 is oriented in a direction avoiding the support pillar 1. Thus, according to the transmitting antenna device to which the three-plane synthetic antenna 20 is attached, the antenna characteristics of the antennas 10 and 20 can sufficiently function without causing the antennas 10 and 20 to interfere with each other. Therefore, the VHF band television broadcast wave radiated from the super-turn style antenna 10 and the UHF band television broadcast wave radiated from the three-plane composite antenna 20 are efficiently directed toward a predetermined broadcast service area. It becomes possible to transmit. In particular, since the antennas 10 and 20 can be installed at the same height position (ground height) in the broadcasting tower, it is possible to obtain an effect that the radio wave reachable distance can be sufficiently secured.

  The present invention is not limited to the embodiment described above. For example, the position where the auxiliary support 2 is provided may be in any direction of the position separated by the distance D from the support column 1 described above. That is, you may provide the auxiliary support body 2 in the position of the degree on the surrounding surface of the radius D centering on the support pillar 1. FIG. When the auxiliary support 2 is provided between the two bad wing antennas 11, the distance D is shortened within a range that does not hinder the installation of the panel antenna 21, and the installation position of the multi-plane synthetic antenna 20 is set to the support pillar 1. You may make it approach.

  In the embodiment, the super turn style antenna 10 having a three-stage configuration is shown. However, the number of the configuration stages is not particularly limited, and a plurality of super turn style antennas 10 having different allocation frequencies (channels) are arranged in multiple stages. Of course it is possible. Furthermore, it is of course possible to change the number of constituent stages of the multi-plane composite antenna 20 according to the required power gain, or to arrange a plurality of multi-plane composite antennas 20 having different allocation frequencies (channels). It goes without saying that the antenna dimensions and the like may be set according to the transmission frequency.

  When it is necessary to radiate radio waves from the panel antenna 21 in all directions, another auxiliary support is provided at a position opposite to the side on which the three-plane composite antenna 20 is provided. It is also possible to provide another panel antenna 21 and a multi-sided combined antenna 20. Alternatively, as shown in FIG. 5, auxiliary support bodies 2 are provided on the extension lines of the respective antenna surfaces of the four bad wing antennas 11a, 11b, 11c, and 11d constituting the super turn antenna 10, and each of these auxiliary support bodies 2 is provided. The panel antenna 21 may be attached so that its antenna surface is parallel to each bad wing antenna 11. In other words, the antenna surfaces of the four panel antennas 21 may be sequentially skewed by 90 ° to thereby construct a transmission antenna having omnidirectional antenna characteristics.

  Note that the above-described multi-plane synthetic antenna 20 can be configured by using panel antennas 21 having four or more planes. Furthermore, it is of course possible to implement the panel antenna 21 itself by using a two-element double-loop antenna or a dipole antenna instead of the above-described four-element double-loop antenna, and these antenna elements are arranged side by side in parallel. Thus, the panel antenna 21 can be configured.

  In addition, the connecting member 3 described above can be configured such that the mounting height position with respect to the support column 1 can be adjusted, and further, the support position of the auxiliary column 2 can be adjusted, that is, the distance of the auxiliary column 2 from the support column 1. It is also useful to make D adjustable. Furthermore, the panel antenna 21 may be installed without using the holding support 2 described above by attaching the upper end portion and the lower end portion of the panel antenna 21 to the connecting member 3. In this case, the connecting member 3 itself functions as the auxiliary support 2. Also, here, an antenna for television broadcasting has been described as an example, but it goes without saying that the present invention can be similarly applied to the construction of antennas for various types of information communication. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

The front view and top view which show schematic structure of the transmission antenna apparatus which concerns on one Embodiment of this invention. The top view and side view which show schematic structure of the panel antenna attached to the transmission antenna apparatus shown in FIG. The figure which shows the directional characteristic of the super turn style antenna in the transmission antenna apparatus shown in FIG. The figure which shows the directional characteristic of the polyhedral synthetic | combination antenna in the transmission antenna apparatus shown in FIG. The figure which shows the example of the transmission antenna apparatus comprised by carrying out skew arrangement | sequence of four panel antennas.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support pillar 2 Auxiliary support 3 Connection member (auxiliary support)
10 Super Turn Style Antenna 11 Badwing Antenna 20 Multi-Plane Synthetic Antenna 21 Panel Antenna 22 4 Element Dual Loop Antenna

Claims (4)

A supporting pillar vertically provided at a predetermined ground height;
A super turn style antenna constructed by a plurality of bad wing antennas supported by the support column and arranged around the support column at right angles to each other;
An auxiliary support attached to the support post;
A transmitting antenna device comprising a panel antenna supported by the auxiliary support and having an antenna surface provided in parallel with the support column at a certain distance from the support column.   2. The transmission according to claim 1, wherein the auxiliary support supports the panel antenna at a position where the surface of the bad wing antenna is extended or a region sandwiched by the surfaces of the bad wing antennas arranged at right angles to each other. Antenna device.   The transmitting antenna device according to claim 1, wherein the panel antenna is composed of a plurality of panel antennas that are supported by the auxiliary support and are arranged around the auxiliary support pillar to construct a multi-sided synthetic antenna.   4. The transmission according to claim 3, wherein the plurality of panel antennas are arranged on a surface excluding a surface facing the support column, and construct a multi-plane composite antenna having a null direction as a direction facing the support column. Antenna device.

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